IEC 61097-13:2003

INTERNATIONAL IEC
STANDARD
61097-13
First edition
2003-05
Global maritime distress and safety
system (GMDSS) –
Part 13:
INMARSAT F77 ship earth station equipment –
Operational and performance requirements,
methods of testing and required test results
Reference number
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INTERNATIONAL IEC
STANDARD
61097-13
First edition
2003-05
Global maritime distress and safety
system (GMDSS) –
Part 13:
INMARSAT F77 ship earth station equipment –
Operational and performance requirements,
methods of testing and required test results
 IEC 2003  Copyright - all rights reserved
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mechanical, including photocopying and microfilm, without permission in writing from the publisher.
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– 2 – 61097-13  IEC:2003(E)
CONTENTS
FOREWORD . 3
1 Scope . 4
2 Normative references. 5
3 Definitions and abbreviations . 5
3.1 Definitions . 5
3.2 Abbreviations. 7
4 General and operational requirements . 8
4.1 General requirements . 8
4.2 Operational requirements for INMARSAT F77 SES . 8
5 Technical requirements.10
5.1 Pre-emption by distress calls (ship originated).10
5.2 Electromagnetic compatibility (EMC).11
5.3 Spurious emissions.11
5.4 Power supply.11
5.5 Excessive conditions .11
5.6 Power supply interruption .11
5.7 Interfaces .11
6 Methods of testing and required test results.12
6.1 General .12
6.2 Test using local distress button.14
6.3 Test using remote distress button .14
6.4 Operational tests (without pre-emption) .14
6.5 Operational tests (with pre-emption) .15
6.6 Power supply testing.21
6.7 Interface testing.21
Annex A (informative) Requirements relating to installation .22
Annex B (informative) Reception of maritime safety information (MSI).23
Annex C (informative) List of INMARSAT F77 type-approval tests .24
Bibliography.25

61097-13  IEC:2003(E) – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
GLOBAL MARITIME DISTRESS AND SAFETY SYSTEM (GMDSS) –
Part 13: INMARSAT F77 ship earth station equipment –
Operational and performance requirements,
methods of testing and required test results
FOREWORD
1) The IEC (International Electrotechnical Commission) is a world wide organization for standardization
comprising all national electrotechnical committees (IEC National Committees). The object of the IEC is to
promote international co-operation on all questions concerning standardization in the electrical and electronic
fields. To this end and in addition to other activities, the IEC publishes International Standards. Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt
with may participate in this preparatory work. International, governmental and non-governmental organizations
liaising with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61097-13 has been prepared by IEC technical committee 80:
Maritime navigation and radiocommunication equipment and systems.
The text of this standard is based on the following documents:
FDIS Report on voting
80/358/FDIS 80/370/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this publication will remain unchanged until
2008-01. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 4 – 61097-13  IEC:2003(E)
GLOBAL MARITIME DISTRESS AND SAFETY SYSTEM (GMDSS) –
Part 13: INMARSAT F77 ship earth station equipment –
Operational and performance requirements,
methods of testing and required test results
1 Scope
This part of IEC 61097 specifies the minimum operational and performance requirements,
technical characteristics, methods of testing and required test results for INMARSAT F77 ship
earth stations (SES), capable of transmitting and receiving distress and safety
communications, initiating and receiving distress priority calls and transmitting and receiving
general radiocommunications, using radiotelephony (voice), as required within Regulation
IV/10.1 and 14.1 of the 1988 amendments to the 1974 International Convention for the Safety
of Life at Sea (SOLAS), for use in the GMDSS.
The INMARSAT F77 is intended to meet the voice requirements of IMO Resolution A.888(21).
In order to meet the GMDSS carriage requirements of SOLAS in respect of receipt of
SafetyNET broadcasts and direct printing telegraphy, it is necessary to install a combined
INMARSAT C/EGC transceiver in addition to the INMARSAT F77 equipment. Annex B
provides more information. Since Class 1 INMARSAT A and B ship earth stations meet the
data requirement of GMDSS, although not necessarily those of MSC.130(75), the F77 cannot
necessarily be considered as a direct replacement for these ship earth stations.
This standard also takes into account the priority access (voice pre-emption) requirements of
IMO Resolution A.888(21).
This standard takes account of IMO Resolution A.694(17) to which is associated IEC 60945.
When a requirement in this standard is different from IEC 60945, the requirement in this
standard shall take precedence.
This standard incorporates the performance standards of IMO Resolution MSC.130(75) and
the clarifications of certain requirements in IMO performance standards for GMDSS
Equipment defined in IMO MSC Circular 862. It also incorporates the relevant ITU Radio
Regulations.
All text of this standard, whose wording is identical to that in the IMO SOLAS Convention
1974 as amended, IMO Resolutions and IMO MSC Circular 862, is printed in italics and the
Resolution or Recommendation and paragraph number indicated between brackets.
It is a requirement of INMARSAT Ltd that all INMARSAT F77 mobile earth station models be
type-approved by INMARSAT before they can be allowed access to the INMARSAT space
segment. This testing is designed to demonstrate that the equipment under test will be
compatible with the INMARSAT F77 system and will not cause interference to other satellite
users. It is recommended that approval authorities accept testing organized and supervised
by INMARSAT, which results in INMARSAT type approval, without additional testing other
than that defined in this standard.
It is also recommended that equipment manufacturers rationalize the test requirements of this
standard and those of INMARSAT before embarking on the approval process.
NOTE This standard does not incorporate the INMARSAT system requirements needed for INMARSAT type
approval. For these, the latest edition of “INMARSAT mini-M SDM Change Note No. 65” should be consulted. When
a requirement in this standard is different from one in the above-mentioned INMARSAT document, reference shall
be made to the most recent IMO and ITU applicable documents to resolve the difficulty.

61097-13  IEC:2003(E) – 5 –
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60945, Maritime navigation and radio communication equipment and systems – General
requirements – Methods of testing and required test results
IEC 61162 (all parts), Maritime navigation and radio communication equipment and systems –
Digital interfaces
IEC 61162-1, Maritime navigation and radio communication equipment and systems – Digital
interfaces – Part 1: Single talker and multiple listeners
ISO/IEC 17025, General requirements for the competence of testing and calibration
laboratories
IMO International Convention for the Safety of Life at Sea (SOLAS)
IMO Resolution A.694(17), General requirements for shipborne radio equipment forming part
of the Global Maritime Distress and Safety System (GMDSS) and for electronic navigational
aids
IMO Resolution A.888(21), Criteria for the provision of mobile-satellite communication
systems in the Global Maritime Distress and Safety System (GMDSS)
IMO Resolution MSC.130(75), Performance standards for INMARSAT ship earth stations
capable of two-way communications
IMO MSC Circular 862, Clarifications of certain requirements in IMO performance standards
for GMDSS Equipment
INMARSAT mini-M SDM Change Note No. 65
ITU Radio Regulations
3 Definitions and abbreviations
3.1 Definitions
For the purposes of this International Standard, the following definitions apply.
3.1.1
carrier-to-noise density ratio
ratio of unmodulated carrier power-to-noise power normalized to a 1 Hz bandwidth
3.1.2
INMARSAT priorities
priority 3 = distress
priority 2 = urgency
priority 1 = safety
priority 0 = routine
– 6 – 61097-13  IEC:2003(E)
3.1.3
INMARSAT type approval
testing of a ship earth station design by INMARSAT. This approval is required for access to
the INMARSAT space segment and is essential before approvals can be granted by national
administrations
3.1.4
L-band
frequency band in the range 1,4 GHz to 1,7 GHz allocated to the mobile satellite service and
in which the EUT transmits and receives
3.1.5
necessary bandwidth
for a given class of emission, width of the frequency band which is just sufficient to ensure the
transmission of information at the rate and with the quality required under specified conditions
3.1.6
out-of-band emission
emission on a frequency or frequencies immediately outside the necessary bandwidth which
results from the modulation process, but excluding spurious emissions
3.1.7
performance check
short functional test carried out during or after a technical test to confirm that the equipment
operates
[IEC 60945]
3.1.8
performance test
measurement or group of measurements carried out during or after a technical test to confirm
that the equipment complies with selected parameters as defined in this standard
[IEC 60945]
3.1.9
physical layer test-set (PLT)
item of test equipment designed to simulate the combined operation of an INMARSAT satellite
and an INMARSAT F77 Land Earth Station. The PLT interfaces to the EUT at L-band, either
by means of a small antenna or via coaxial cable. It permits voice calls to be set up in
accordance with the relevant INMARSAT F77 protocols
3.1.10
pre-emption
automatic clearance of an ongoing call to enable a call of higher priority to be established
3.1.11
radiofrequency hazards
hazards caused by electromagnetic radiofrequency radiation, the level of which would require
safety rules to be applied in the vicinity of the radiating equipment
3.1.12
radome
radiofrequency transparent cover placed over an antenna system
3.1.13
SafetyNET
service provided over a dedicated INMARSAT-C carrier, for the dissemination of maritime
safety information, such as distress alerts, weather forecasts and coastal warnings

61097-13  IEC:2003(E) – 7 –
3.1.14
spurious emissions
emissions on a frequency or frequencies which are outside the necessary bandwidth, the level
of which may be reduced without affecting the corresponding transmission of information.
Spurious emissions include harmonic emissions, parasitic emissions, intermodulation products
and frequency conversion products but exclude out-of-band emissions
3.1.15
standard tests
two tests defined in this document as Test A – Duplex Telephone Test (ship-originated) and
Test B – Duplex Telephone Test (shore-originated) which together form the performance test
required by IEC 60945
3.1.16
unwanted emissions
spurious emissions and out-of-band emissions
3.2 Abbreviations
ACSE Access control and signalling equipment
BER Bit error rate
BPSK Binary phase shift keying
C/No Carrier-to-noise density ratio in 1 Hz bandwidth
EGC Enhanced group call
EIRP Effective isotropic radiated power
EMC Electromagnetic compatibility
EUT Equipment under test
GMDSS Global maritime distress and safety system
G/T Satellite receiver “figure of merit”
HPA High power amplifier
ID Identity
IEC International Electrotechnical Commission
IMO International Maritime Organization
INMARSAT INMARSAT Ltd.
ISO International Organization for Standardization
ITU International Telecommunications Union
LES Land earth station
LESP Land earth station packet data channel
MES Mobile earth station
MESP Mobile earth station packet data channel
MPDS INMARSAT’s mobile packet data service (for example, Internet access)
MSI Maritime safety information
16-QAM Quaternary amplitude modulation (16-state)
O-QPSK Offset quaternary phase shift-keying
PLT Physical layer test-set
RCC Rescue coordination centre
SDM System definition manual (published by INMARSAT)
SES Ship earth station
SOLAS International convention for the safety of life at sea

– 8 – 61097-13  IEC:2003(E)
4 General and operational requirements
This Clause 4 includes the requirements taken from IMO SOLAS and IMO Resolutions
MSC.130(75) and A.694(17) for which no repeatable or verifiable test can be specified or for
which the test is limited to the verification of documentation presented by the manufacturer. It
contains all operational tests, particularly those involving subjective judgement and which
shall be conducted by personnel approved by national administrations. Some of the
requirements listed in this clause are in addition to the relevant operational requirements of
IEC 60945, which are also applicable.
4.1 General requirements
4.1.1 Definition
An INMARSAT F77 ship earth station, which is defined in the “INMARSAT mini-M SDM
Change Note No. 65”, shall be capable of
a) transmitting and receiving distress and safety communications;
b) initiating and receiving distress priority calls; and
c) transmitting and receiving general radio communications, using radiotelephony.
4.1.2 INMARSAT type approval
(MSC.130/A.2) The equipment shall be type approved by INMARSAT and shall comply with
the environmental conditions specified in its technical requirements for INMARSAT ship earth
stations capable of two-way communications. INMARSAT type approval is required for access
to the INMARSAT space segment and is essential before approvals can be granted by
national administrations.
4.1.3 Ship earth station installation requirements
(MSC.130/A.1) The ship earth station installation (which will normally comprise an
INMARSAT F77 transceiver and an additional INMARSAT-C/EGC transceiver) capable of
telephony and data communications shall comply with the applicable general requirements set
out in IMO resolution A.694(17) as detailed in IEC 60945.
4.2 Operational requirements for INMARSAT F77 SES
4.2.1 Prevention of alteration of ship earth station identity
(MSC.130/A.3.1) No control external to the equipment shall be available for alteration of the
ship earth station identity.
4.2.2 Initiation of distress calls
(MSC.130/A.3.2) It shall be possible to initiate and make distress calls by telephony or data
communications from the position at which the ship is normally navigated and from any
position designated for distress alerting. In addition, where a room is provided for radio
communications, means to initiate distress calls shall also be fitted in that room. A suitable
interface on the EUT to enable these two requirements to be achieved shall be provided by
the equipment manufacturer.
4.2.3 Dedicated distress button
4.2.3.1 Distress activation
(MSC.130/A.3.5) A distress call shall be activated only by means of a dedicated distress
button. This button shall not be any key of an ITU-T digital input panel or an ISO keyboard
provided on the equipment.
61097-13  IEC:2003(E) – 9 –
(MSC.130/A.3.4) It shall be possible to interrupt and initiate distress calls at any time.
(MSC.130/A.3.6) The dedicated button shall
.1 be clearly identified; and
.2 be protected against inadvertent operation.
(MSC.130/A.3.7) The distress call initiation shall require at least two independent actions.
4.2.3.2 Clarification (MSC Circular 862)
MSC Circular 862 provides the following clarifications by IMO:
“DEDICATED DISTRESS BUTTON” – This button should not be any key of an ITU-T input
panel or an ISO keyboard associated with the equipment and should be physically separated
from functional buttons/keys used for normal operation. This button should be a single button
for no other purpose than to initiate a distress alert.
“CLEARLY IDENTIFIED” – The distress button should be red in colour and marked
“DISTRESS”. Where a non-transparent protective lid or cover is used, it should also be
marked “DISTRESS”.
“PROTECTED AGAINST INADVERTENT ACTIVATION” – The required protection of the
distress button should consist of a spring-loaded lid or cover permanently attached to the
equipment for example, hinges. It should not be necessary for the user to remove additional
seals or to break the lid or cover in order to operate the distress button.
The operation of the distress button should generate a visible and audible indication. The
distress button should be kept pressed for at least 3 seconds. A flashing light and an
intermittent acoustic signal should start immediately. After 3 seconds the transmission of the
distress alert is initiated, the visible indication shall become steady and the acoustic indication
shall cease.
NOTE INMARSAT F 1 Service definition provides the following clarification. The MES should ensure that
selection of Maritime Distress priority shall not become effective until the switch contacts have been continuously
held closed for a period of at least 5 s.
“AT LEAST TWO INDEPENDENT ACTIONS” – Lifting of the protective lid or cover is
considered as the first action. Pressing the distress button as specified above is considered
the second independent action.
4.2.3.3 Indications of distress call initiation
Audible and visible indications shall be made at all positions from where a distress call may
be initiated, irrespective of the telephone terminal from which the distress call is originated.
The visible indications shall continue until reset manually. This reset facility shall only be
available to authorized personnel. It shall be possible to initiate further distress calls without
re-setting the first indication. During performance testing with distress priority, indications
shall be identical to those generated by initiation of a real distress call.
4.2.4 Alarm on reception of shore-originated duplex calls with distress priority
(MSC.130/A.3.3) Where no other means of receiving distress, urgency and safety
broadcasts or an additional distress alert relay are provided and existing levels of aural
signals produced by the telephone or printer are considered to be inadequate, the ship earth
station equipment shall provide an aural/visual alarm of appropriate level. An output shall be
provided to actuate an external aural/visual alarm on the receipt of a distress priority duplex
call. (Distress, urgency and safety broadcasts are received by associated INMARSAT-C/EGC
receiving equipment – Annex B refers)

– 10 – 61097-13  IEC:2003(E)
4.2.5 Radiofrequency hazards
(MSC.130/A.4) In order to permit warnings of potential hazards to be displayed in
appropriate places, a label shall be attached to the radome by the equipment manufacturer,
2 2 2
indicating the distance at which radiation levels of 100 W/m , 25 W/m and 10 W/m exist.
The label shall have characters at least 20 mm high and be clearly readable in the normally
installed position from a distance of at least 5 m. The maximum distance from the EUT
at which the power density level of 100 W/m has been measured by the equipment
manufacturer shall be included in the equipment manual. The power density at this distance
shall be re-measured and the level specified in the equipment manual and on the label
confirmed. The readability of the label at a distance of 5 m shall also be confirmed.
4.2.6 Safety precautions
The EUT shall satisfy the requirements for safety as stated in IMO resolution A.694(17) and
detailed in IEC 60945 (A.694/A.7).
4.2.7 Equipment manual
The manual shall comply with the requirements of IEC 60945 as applicable.
The manual shall contain information for the installation to comply with IMO requirements as
detailed in Annex A.
The manual shall also address the issue of reception of maritime safety information (MSI)
(see Annex B).
The manual shall also include a cautionary note to the effect that, before clearance of a
distress priority call is initiated, the RCC must be advised as to why the call is being cleared.
The manual shall include the maximum distance from the radome at which a power density of
100 W/m has been measured by the manufacturer of the EUT.
4.2.8 Marking and identification
Marking and identification shall comply with the requirements of IEC 60945 as applicable and
with the special requirements of 4.2.6 above.
4.2.9 Maintenance
The EUT shall comply with the maintenance requirements of IEC 60945 as applicable.
5 Technical requirements
This Clause 5 includes all
...